Techniques for radio link failure recovery and beam failure recovery on secondary cell group in dormancy state

ABSTRACT

Aspects of the present disclosure include methods, apparatuses, and computer readable media for radio link failure recovery and beam failure recovery on a secondary cell group (SCG) in dormancy state. In an example, a user equipment (UE) may determine the UE has entered a dormant state with respect to the SCG of a secondary node (SN) having a primary SCG cell (PSCell). The UE may monitor the PSCell to detect a beam failure or a radio link failure while the UE is in the dormant state with respect to the SCG. The UE may transmit, to the SN, a report based on the beam failure or the radio link failure on the PSCell being detected.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Non-Provisional applicationSer. No. 17/338,075 entitled “TECHNIQUES FOR RADIO LINK FAILURE RECOVERYAND BEAM FAILURE RECOVERY ON SECONDARY CELL GROUP IN DORMANCY STATE” andfiled on Jun. 3, 2021, which claims the benefit of U.S. ProvisionalApplication Ser. No. 63/065,282, entitled “TECHNIQUES FOR RADIO LINKFAILURE RECOVERY AND BEAM FAILURE RECOVERY ON SECONDARY CELL GROUP INDORMANCY STATE” and filed on Aug. 13, 2020, which are expresslyincorporated by reference herein in its entirety.

BACKGROUND

Aspects of the present disclosure relate generally to wirelesscommunications, and more particularly, to apparatuses and methods fortechniques for radio link failure (RLF) recovery and beam failurerecovery on secondary cell group (SCG) in a dormancy state.

Wireless communication networks are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be multiple-accesssystems capable of supporting communication with multiple users bysharing the available system resources (e.g., time, frequency, andpower). Examples of such multiple-access systems include code-divisionmultiple access (CDMA) systems, time-division multiple access (TDMA)systems, frequency-division multiple access (FDMA) systems, orthogonalfrequency-division multiple access (OFDMA) systems, and single-carrierfrequency division multiple access (SC-FDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. For example, a fifth generation (5G)wireless communications technology (which may be referred to as newradio (NR) technology) is envisaged to expand and support diverse usagescenarios and applications with respect to current mobile networkgenerations. In an aspect, 5G communications technology may include:enhanced mobile broadband addressing human-centric use cases for accessto multimedia content, services and data; ultra-reliable-low latencycommunications (URLLC) with certain specifications for latency andreliability; and massive machine type communications, which may allow avery large number of connected devices and transmission of a relativelylow volume of non-delay-sensitive information. As the demand for mobilebroadband access continues to increase, however, further improvements inNR communications technology and beyond may be desired.

SUMMARY

Systems, methods, and apparatus presented herein each have severalinnovative aspects, no single one of which is solely responsible for thedesirable attributes disclosed herein. The following presents asimplified summary of one or more aspects in order to provide a basicunderstanding of such aspects. This summary is not an extensive overviewof all contemplated aspects, and is intended to neither identify key orcritical elements of all aspects nor delineate the scope of any or allaspects. Its sole purpose is to present some concepts of one or moreaspects in a simplified form as a prelude to the more detaileddescription that is presented later.

In an aspect, a method of wireless communication by a user equipment(UE) is provided. The method may include determining the UE has entereda dormant state with respect to a secondary cell group (SCG) of asecondary node (SN) having a primary SCG cell (PSCell) and one or moresecondary cells (SCells). The method may include monitoring the SCG todetect a radio link failure on the PSCell or a beam failure on one ofthe PSCell or an SCell of the one or more SCells, while the UE is in thedormant state with respect to the SCG. The method may includetransmitting, to the SN, a report based on the radio link failure or thebeam failure being detected.

In another aspect, a method of wireless communication by an apparatus ofa PSCell associated with an SCG is provided. The method may includereceiving, from the UE, a report based on a radio link failure beingdetected on the PSCell or a beam failure being detected on one of thePSCell or an SCell of one or more SCells of the SCG, in response to theUE being in a dormant state with respect to the SCG. The method mayinclude determining to perform a recovery procedure with the UE or tonot perform the recovery procedure in response to the report. The methodmay include transmitting, to the UE, an indication that the recoveryprocedure will be performed or not performed.

In other aspects, apparatus configured to perform one or more methodsherein are provided. In other aspects, computer readable mediums havinginstructions that cause one or more processors to perform one or moremethods herein are provided. In other aspects, apparatus having meansfor performing one or more methods herein are provided.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosed aspects will hereinafter be described in conjunction withthe appended drawings, provided to illustrate and not to limit thedisclosed aspects, wherein like designations denote like elements, andin which:

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network, according to aspects of the presentdisclosure;

FIG. 2 is a schematic diagram of an example of a user equipment (UE) ofFIG. 1 , according to aspects of the present disclosure;

FIG. 3 is a schematic diagram of an example of a base station of FIG. 1, according to aspects of the present disclosure;

FIG. 4 is call flow diagram of an example beam failure procedure,according to aspects of the present disclosure;

FIG. 5 is call flow diagram of another example beam failure procedure,according to aspects of the present disclosure;

FIG. 6 is call flow diagram of another example beam failure procedure,according to aspects of the present disclosure;

FIG. 7 is call flow diagram of an example radio link failure procedure,according to aspects of the present disclosure;

FIG. 8 is call flow diagram of another example radio link failureprocedure, according to aspects of the present disclosure;

FIG. 9 is a flow diagram of an example method performed by the UE ofFIG. 1 , according to aspects of the present disclosure; and

FIG. 10 is flow diagram of an example method performed by the basestation of FIG. 1 , according to aspects of the present disclosure.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Multiple-radio dual-connectivity (MR-DC) may allow a user equipment (UE)to communicate with two radio access networks (RANs), for example,utilizing two frequency bands. One RAN may be provided by a master node(MN) and the other RAN may be provided by a secondary node (SN). The UEmay communicate with a group of cells in each of the RANs. For example,the MN may include a master cell group (MCG) and the SN may include asecondary cell group (SCG). In some scenarios, the SCG for the UE may bedormant. For instance, when a data rate for the UE is sufficiently low,the UE is overheating, or based on specific traffic types (e.g., voiceover internet protocol (VOIP)), the SCG for the UE may be placed in adormant SCG state. In the dormant SCG state, the UE may have reducedpower consumption and limited communications and measurements (e.g.,downlink (DL) control, data monitoring, radio resource management (RRM),channel status information (CSI) measurements) on the SCG.

The present disclosure provides techniques for the UE to transition fromthe dormant SCG state to an active SCG state using beam failure andradio link failure (RLF) procedures on a primary SCG cell (PSCell) ofthe SCG while the UE is in the dormant SCG state. In particular, a goalof the UE during the dormant SCG state is to achieve power saving withreduced latency for the SCG during a transition from the dormant SCGstate to the active SCG state. In doing so, additional signaling andmeasurements for beam management may be used for frequency rangedesignations FR1 (e.g., 410 MHz-7.125 GHz) and FR2 (e.g., 24.25 GHz-52.6GHz). Examples of the measurements include RRMs, radio link monitoring(RLMs), beam failure detection (BFD) measurements, and, in some cases,Layer 1 (L1) measurements. In an example, L1 measurements include CSImeasurements and sounding reference signal (SRS) transmissions thatenable mechanisms such as beam management, time tracking, etc.

In an aspect, an RLM procedure may be enabled on the PSCELL when the SCGis in the dormant SCG state to detect a radio link failure (RLF) on thePSCell. As opposed to conventional RLM methods, which only apply RLMprocedures to active bandwidth parts, in this proposal the RLM procedureis performed on the dormant bandwidth parts of the PSCELL. In anexample, the RLM procedure may be performed on the PSCell and notsecondary cells (SCells) of the SCG. For example, for new radio dualconnectivity (NR-DC) intraband carrier aggregation (CA), both the PSCelland the SCells may use FR2, which may result in measurements of thePSCell that highly correlate to the SCells of the SCG in this case.

In another aspect, a BFD procedure is performed to detect BFD. The BFDprocedure may be performed on both the PSCELL and SCELLs of the SCG. ForE-tran new radio dual connectivity (EN-DC) interband CA, the PSCell mayuse FR1 and the SCells may use FR2, which may result in measurements ofthe PSCell that do not correlate with the SCells of the SCG in thiscase. For example, the Quasi Co-Locations (QCLs)/spatial relationshipson the PSCELL and SCELLs may be vastly different in the EN-DC interbandCA.

In the dormant SCG state, the RLM procedure may ensure that the PSCellRLF and beam failure are detected, and the BFD may ensure that the beamfailure on the SCells are detected.

Regarding BFD, if a beam failure is detected, a beam failure report maybe communicated to an SN by sending a beam failure report through arandom access channel (RACH) to the SN through the PSCell. In anexample, the RACH message may be performed with a best DL beam of thePSCell or the SCells being identified after the BFD.

Alternatively, if a beam failure is detected, the beam failure reportmay be communicated to the SN with the best DL beam (or buffer statusreport) through the MCG of the MN. In this example, the communicationmay be done via radio resource control (RRC) signaling, media accesscontrol control element (MAC CE) signaling, or DL control information(DCI) signaling.

After the SN receives the report, the SN may notify the UE whether toperform a beam failure recovery (BFR) on the SCG or not. If the BFR isneeded, the SN may give the UE contention free resources to RACH. If theBFR is not needed, the SN may indicate to the UE to remain in thedormant SCG state.

Whether to send the report to the SN via a RACH message or the MCG maybe configured at a start of the dormancy SCG state or dynamicallyconfigured and sent to the SCG through MCG during dormancy.

Regarding RLF, if an RLF is detected, a message can be sent to the SNthrough the MCG. In response to the message, the SN may decide to stayin an RLF state for a duration of time, as the SCG is in dormancy andmay not need immediate recovery. Alternatively, the SN may triggermeasurements on the SCells to see if the PScell can be replaced with oneof the SCells in the SCG.

Performing the additional signaling and measurements, including RLM andBFD as described herein, may provide quick transition out of the dormantSCG state, as compared to methods used without these signaling andmeasurements.

Several aspects of telecommunication systems will now be presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, components, circuits,processes, algorithms, etc. (collectively referred to as “elements”).These elements may be implemented using electronic hardware, computersoftware, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented as a “processing system” thatincludes one or more processors. Examples of processors includemicroprocessors, microcontrollers, graphics processing units (GPUs),central processing units (CPUs), application processors, digital signalprocessors (DSPs), reduced instruction set computing (RISC) processors,systems on a chip (SoC), baseband processors, field programmable gatearrays (FPGAs), programmable logic devices (PLDs), state machines, gatedlogic, discrete hardware circuits, and other suitable hardwareconfigured to perform the various functionality described throughoutthis disclosure. One or more processors in the processing system mayexecute software. Software shall be construed broadly to meaninstructions, instruction sets, code, code segments, program code,programs, subprograms, software components, applications, softwareapplications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, functions, etc., whetherreferred to as software, firmware, middleware, microcode, hardwaredescription language, or otherwise.

Accordingly, in one or more example embodiments, the functions describedmay be implemented in hardware, software, or any combination thereof. Ifimplemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that may be accessed by a computer. By way ofexample, and not limitation, such computer-readable media may comprise arandom-access memory (RAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), optical disk storage, magnetic diskstorage, other magnetic storage devices, combinations of theaforementioned types of computer-readable media, or any other mediumthat may be used to store computer executable code in the form ofinstructions or data structures that may be accessed by a computer.

Turning now to the figures, examples of systems, apparatus, and methodsfor RLF recovery and beam failure recovery on SCG in a dormancy stateare depicted. It is to be understood that aspects of the figures may notbe drawn to scale and are instead drawn for illustrative purposes.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100. The wireless communications system(also referred to as a wireless wide area network (WWAN)) includes atleast one base station 105, UEs 110, an Evolved Packet Core (EPC) 160,and a 5G Core (5GC) 190. The base station 105 may include macro cells(high power cellular base station) and/or small cells (low powercellular base station). The macro cells include base stations. The smallcells include femtocells, picocells, and microcells.

In some implementations, the base station 105 may include a modem 140and/or an SCG recovery component 142 for recovering the SCG on the UE110. In some implementations, the UE 110 may include a modem 144 and/oran SCG dormancy management component 146 for managing SCG during adormant SCG state.

A base station 105 configured for 4G LTE (collectively referred to asEvolved Universal Mobile Telecommunications System (UMTS) TerrestrialRadio Access Network (E-UTRAN)) may interface with the EPC 160 throughbackhaul links interfaces 132 (e.g., S1, X2, Internet Protocol (IP), orflex interfaces). A base station 105 configured for 5G NR (collectivelyreferred to as Next Generation RAN (NG-RAN)) may interface with 5GC 190through backhaul links interfaces 134 (e.g., S1, X2, Internet Protocol(IP), or flex interface). In addition to other functions, the basestation 105 may perform one or more of the following functions: transferof user data, radio channel ciphering and deciphering, integrityprotection, header compression, mobility control functions (e.g.,handover, dual connectivity), inter-cell interference coordination,connection setup and release, load balancing, distribution fornon-access stratum (NAS) messages, NAS node selection, synchronization,radio access network (RAN) sharing, multimedia broadcast multicastservice (MBMS), subscriber and equipment trace, RAN informationmanagement (RIM), paging, positioning, and delivery of warning messages.The base station 105 may communicate directly or indirectly (e.g.,through the EPC 160 or 5GC 190) with each other over the backhaul linksinterfaces 134. The backhaul links 132, 134 may be wired or wireless.

The base station 105 may wirelessly communicate with the UEs 110. Eachof the base station 105 may provide communication coverage for arespective geographic coverage area 130. There may be overlappinggeographic coverage areas 130. For example, the small cell 105′ may havea coverage area 130′ that overlaps the coverage area 130 of one or moremacro base station 105. A network that includes both small cell andmacro cells may be known as a heterogeneous network. A heterogeneousnetwork may also include Home Evolved Node base station (eNBs) (HeNBs),which may provide service to a restricted group known as a closedsubscriber group (CSG). The communication links 120 between the basestation 105 and the UEs 110 may include uplink (UL) (also referred to asreverse link) transmissions from a UE 110 to a base station 105 and/orDL (also referred to as forward link) transmissions from a base station105 to a UE 110. The communication links 120 may use multiple-input andmultiple-output (MIMO) antenna technology, including spatialmultiplexing, beamforming, and/or transmit diversity. The communicationlinks may be through one or more carriers. The base station 105/UEs 110may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz)bandwidth per carrier allocated in a carrier aggregation of up to atotal of Y_(x) MHz (x component carriers) used for transmission in eachdirection. The carriers may or may not be adjacent to each other.Allocation of carriers may be asymmetric with respect to DL and UL(e.g., more or less carriers may be allocated for DL than for UL). Thecomponent carriers may include a primary component carrier and one ormore secondary component carriers. A primary component carrier may bereferred to as a primary cell (PCell) and a secondary component carriermay be referred to as a secondary cell (SCell).

Certain UEs 110 may communicate with each other using device-to-device(D2D) communication link 158. The D2D communication link 158 may use theDL/UL WWAN spectrum. The D2D communication link 158 may use one or moresidelink channels, such as a physical sidelink broadcast channel(PSBCH), a physical sidelink discovery channel (PSDCH), a physicalsidelink shared channel (PSSCH), and a physical sidelink control channel(PSCCH). D2D communication may be through a variety of wireless D2Dcommunications systems, such as for example, FlashLinQ, WiMedia,Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154 in a 5 GHz unlicensed frequency spectrum. Whencommunicating in an unlicensed frequency spectrum, the STAs 152/AP 150may perform a clear channel assessment (CCA) prior to communicating inorder to determine whether the channel is available.

The small cell 105′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 105′ may employ NR and use the same 5 GHz unlicensedfrequency spectrum as used by the Wi-Fi AP 150. The small cell 105′,employing NR in an unlicensed frequency spectrum, may boost coverage toand/or increase capacity of the access network.

A base station 105, whether a small cell 105′ or a large cell (e.g.,macro base station), may include an eNB, gNodeB (gNB), or other type ofbase station. Some base stations, such as gNB 180 may operate in atraditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies,and/or near mmW frequencies in communication with the UE 110. When thegNB 180 operates in mmW or near mmW frequencies, the gNB 180 may bereferred to as an mmW base station. Extremely high frequency (EHF) ispart of the radio frequency (RF) in the electromagnetic spectrum. EHFhas a range of 30 GHz to 300 GHz and a wavelength between 1 millimeterand 10 millimeters. Radio waves in the band may be referred to as amillimeter wave. Near mmW may extend down to a frequency of 3 GHz with awavelength of 100 millimeters. The super high frequency (SHF) bandextends between 3 GHz and 30 GHz, also referred to as centimeter wave.Communications using the mmW/near mmW radio frequency band has extremelyhigh path loss and a short range. The mmW base station 180 may utilizebeamforming 182 with the UE 110 to compensate for the path loss andshort range.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMES 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 110 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, and/or other IP services. The BM-SC 170 may provide functionsfor MBMS user service provisioning and delivery. The BM-SC 170 may serveas an entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base station105 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The 5GC 190 may include a Access and Mobility Management Function (AMF)192, other AMFs 193, a Session Management Function (SMF) 194, and a UserPlane Function (UPF) 195. The AMF 192 may be in communication with aUnified Data Management (UDM) 196. The AMF 192 is the control node thatprocesses the signaling between the UEs 110 and the 5GC 190. Generally,the AMF 192 provides QoS flow and session management. All user Internetprotocol (IP) packets are transferred through the UPF 195. The UPF 195provides UE IP address allocation as well as other functions. The UPF195 is connected to the IP Services 197. The IP Services 197 may includethe Internet, an intranet, an IP Multimedia Subsystem (IMS), a PSStreaming Service, and/or other IP services.

The base station 105 may also be referred to as a gNB, Node B, evolvedNode B (eNB), an access point, a base transceiver station, a radio basestation, an access point, an access node, a radio transceiver, a NodeB,eNodeB (eNB), gNB, Home NodeB, a Home eNodeB, a relay, a transceiverfunction, a basic service set (BSS), an extended service set (ESS), atransmit reception point (TRP), or some other suitable terminology. Thebase station 105 provides an access point to the EPC 160 or 5GC 190 fora UE 110. Examples of UEs 110 include a cellular phone, a smart phone, asession initiation protocol (SIP) phone, a laptop, a personal digitalassistant (PDA), a satellite radio, a global positioning system, amultimedia device, a video device, a digital audio player (e.g., MP3player), a camera, a game console, a tablet, a smart device, a wearabledevice, a vehicle, an electric meter, a gas pump, a large or smallkitchen appliance, a healthcare device, an implant, a sensor/actuator, adisplay, or any other similar functioning device. Some of the UEs 110may be referred to as IoT devices (e.g., parking meter, gas pump,toaster, vehicles, heart monitor, etc.). The UE 110 may also be referredto as a station, a mobile station, a subscriber station, a mobile unit,a subscriber unit, a wireless unit, a remote unit, a mobile device, awireless device, a wireless communications device, a remote device, amobile subscriber station, an access terminal, a mobile terminal, awireless terminal, a remote terminal, a handset, a user agent, a mobileclient, a client, or some other suitable terminology.

Referring to FIG. 2 , an example implementation of the UE 110 mayinclude the modem 144 having the SCG dormancy management component 146.The modem 144 and/or the SCG dormancy management component 146 of the UE110 may be configured to manage communications to the base station 105via a cellular network, a Wi-Fi network, or other wireless and wirednetworks.

In some implementations, the UE 110 may include a variety of components,including components such as one or more processors 212 and memory 216and transceiver 202 in communication via one or more buses 244, whichmay operate in conjunction with the modem 144 and the SCG dormancymanagement component 146 to enable one or more of the functionsdescribed herein related to dormancy management of the UE 110. Further,the one or more processors 212, modem 144, memory 216, transceiver 202,RF front end 288 and one or more antennas 265, may be configured tosupport voice and/or data calls (simultaneously or non-simultaneously)in one or more radio access technologies. The one or more antennas 265may include one or more antennas, antenna elements and/or antennaarrays.

In an aspect, the one or more processors 212 may include the modem 144that uses one or more modem processors. The various functions related tothe SCG dormancy management component 146 may be included in the modem144 and/or the processors 212 and, in an aspect, may be executed by asingle processor, while in other aspects, different ones of thefunctions may be executed by a combination of two or more differentprocessors. For example, in an aspect, the one or more processors 212may include any one or any combination of a modem processor, or abaseband processor, or a digital signal processor, or a transmitprocessor, or a receiving device processor, or a transceiver processorassociated with transceiver 202. Additionally, the modem 144 mayconfigure the UE 110 along with the processors 212. In other aspects,some of the features of the one or more processors 212 and/or the modem144 associated with the SCG dormancy management component 146 may beperformed by the transceiver 202.

Also, the memory 216 may be configured to store data used herein and/orlocal versions of applications 275 or the SCG dormancy managementcomponent 146 and/or one or more subcomponents of the SCG dormancymanagement component 146 being executed by at least one processor 212.The memory 216 may include any type of computer-readable medium usableby a computer or at least one processor 212, such as random accessmemory (RAM), read only memory (ROM), tapes, magnetic discs, opticaldiscs, volatile memory, non-volatile memory, and any combinationthereof. In an aspect, for example, the memory 216 may be anon-transitory computer-readable storage medium that stores one or morecomputer-executable codes defining the SCG dormancy management component146 and/or one or more of its subcomponents, and/or data associatedtherewith, when the UE 110 is operating at least one processor 212 toexecute the SCG dormancy management component 146 and/or one or more ofthe subcomponents.

The transceiver 202 may include at least one receiver 206 and at leastone transmitter 208. The receiver 206 may include hardware, firmware,and/or software code executable by a processor for receiving data, thecode comprising instructions and being stored in a memory (e.g.,computer-readable medium). The receiver 206 may be, for example, an RFreceiving device. In an aspect, the receiver 206 may receive signalstransmitted by at least one base station 105. The transmitter 208 mayinclude hardware, firmware, and/or software code executable by aprocessor for transmitting data, the code comprising instructions andbeing stored in a memory (e.g., computer-readable medium). A suitableexample of the transmitter 208 may include, but is not limited to, an RFtransmitter.

Moreover, in an aspect, the UE 110 may include the RF front end 288,which may operate in communication with one or more antennas 265 and thetransceiver 202 for receiving and transmitting radio transmissions, forexample, wireless communications transmitted by at least one basestation 105 or wireless transmissions transmitted by the UE 110. The RFfront end 288 may be coupled with one or more antennas 265 and mayinclude one or more low-noise amplifiers (LNAs) 290, one or moreswitches 292, one or more power amplifiers (PAs) 298, and one or morefilters 296 for transmitting and receiving RF signals.

In an aspect, the LNA 290 may amplify a received signal at a desiredoutput level. In an aspect, each of the LNAs 290 may have a specifiedminimum and maximum gain values. In an aspect, the RF front end 288 mayuse one or more switches 292 to select a particular LNA 290 and thespecified gain value based on a desired gain value for a particularapplication.

Further, for example, one or more PA(s) 298 may be used by the RF frontend 288 to amplify a signal for an RF output at a desired output powerlevel. In an aspect, each of the PAs 298 may have specified minimum andmaximum gain values. In an aspect, the RF front end 288 may use one ormore switches 292 to select a particular PA 298 and the specified gainvalue based on a desired gain value for a particular application.

Also, for example, one or more filters 296 may be used by the RF frontend 288 to filter a received signal to obtain an input RF signal.Similarly, in an aspect, for example, a respective filter 296 may beused to filter an output from a respective PA 298 to produce an outputsignal for transmission. In an aspect, each filter 296 may be coupledwith a specific LNA 290 and/or PA 298. In an aspect, the RF front end288 may use one or more switches 292 to select a transmit or receivepath using a specified filter 296, the LNA 290, and/or the PA 298, basedon a configuration as specified by the transceiver 202 and/or processor212.

As such, the transceiver 202 may be configured to transmit and receivewireless signals through one or more antennas 265 via the RF front end288. In an aspect, the transceiver 202 may be tuned to operate atspecified frequencies such that the UE 110 may communicate with, forexample, one or more of the base stations 105 or one or more cellsassociated with one or more of the base stations 105. In an aspect, forexample, the modem 144 may configure the transceiver 202 to operate at aspecified frequency and power level based on a UE configuration of theUE 110 and the communication protocol used by the modem 144.

In an aspect, the modem 144 may be a multiband-multimode modem, whichmay process digital data and communicate with the transceiver 202 suchthat the digital data is sent and received using the transceiver 202. Inan aspect, the modem 144 may be multiband and be configured to supportmultiple frequency bands for a specific communications protocol. In anaspect, the modem 144 may be multimode and be configured to supportmultiple operating networks and communications protocols. In an aspect,the modem 144 may control one or more components of the UE 110 (e.g., RFfront end 288, transceiver 202) to enable transmission and/or receptionof signals from the network based on a specified modem configuration. Inan aspect, a modem configuration may be based on the mode of the modem144 and the frequency band in use. In another aspect, the modemconfiguration may be based on UE configuration information associatedwith the UE 110 as provided by the network (e.g., base station 105).

Referring to FIG. 3 , an example implementation of the base station 105may include the modem 140 with the SCG recovery component 142 configuredto recover SCG on the UE 110. The modem 140 and/or the SCG recoverycomponent 142 of the base station 105 may be configured to communicatewith the UE 110 via a cellular network, a Wi-Fi network, or otherwireless and wired networks.

In some implementations, the base station 105 may include a variety ofcomponents, including components such as one or more processors 312 andmemory 316 and transceiver 302 in communication via one or more buses344, which may operate in conjunction with the modem 140 and the SCGrecovery component 142 to enable one or more of the functions describedherein related to SCG recovery. Further, the one or more processors 312,the modem 140, the memory 316, the transceiver 302, a RF front end 388,and one or more antennas 365, may be configured to support voice and/ordata calls (simultaneously or non-simultaneously) in one or more radioaccess technologies. The one or more antennas 365 may include one ormore antennas, antenna elements and/or antenna arrays.

In an aspect, the one or more processors 312 may include the modem 140that uses one or more modem processors. The various functions related tothe SCG recovery component 142 may be included in the modem 140 and/orthe processors 312 and, in an aspect, may be executed by a singleprocessor, while in other aspects, different ones of the functions maybe executed by a combination of two or more different processors. Forexample, in an aspect, the one or more processors 312 may include anyone or any combination of a modem processor, or a baseband processor, ora digital signal processor, or a transmit processor, or a receivingdevice processor, or a transceiver processor associated with thetransceiver 302. Additionally, the modem 140 may configure the basestation 105 and the processors 312. In other aspects, some of thefeatures of the one or more processors 312 and/or the modem 140associated with the SCG recovery component 142 may be performed by thetransceiver 302.

Also, the memory 316 may be configured to store data used herein and/orlocal versions of applications 375 or the SCG recovery component 142,and/or one or more subcomponents of the SCG recovery component 142 beingexecuted by at least one processor 312. The memory 316 may include anytype of computer-readable medium usable by a computer or at least oneprocessor 312, such as random access memory (RAM), read only memory(ROM), tapes, magnetic discs, optical discs, volatile memory,non-volatile memory, and any combination thereof. In an aspect, forexample, the memory 316 may be a non-transitory computer-readablestorage medium that stores one or more computer-executable codesdefining the SCG recovery component 142 and/or one or more of thesubcomponents, and/or data associated therewith, when the base station105 is operating at least one processor 312 to execute the SCG recoverycomponent 142 and/or one or more of the subcomponents.

The transceiver 302 may include at least one receiver 306 and at leastone transmitter 308. The at least one receiver 306 may include hardware,firmware, and/or software code executable by a processor for receivingdata, the code comprising instructions and being stored in a memory(e.g., computer-readable medium). The receiver 306 may be, for example,an RF receiving device. In an aspect, the receiver 306 may receivesignals transmitted by the UE 110. The transmitter 308 may includehardware, firmware, and/or software code executable by a processor fortransmitting data, the code comprising instructions and being stored ina memory (e.g., computer-readable medium). A suitable example of thetransmitter 308 may include, but is not limited to, an RF transmitter.

Moreover, in an aspect, the base station 105 may include the RF frontend 388, which may operate in communication with one or more antennas365 and the transceiver 302 for receiving and transmitting radiotransmissions, for example, wireless communications transmitted by otherbase stations 105 or wireless transmissions transmitted by the UE 110.The RF front end 388 may be coupled with one or more antennas 365 andmay include one or more low-noise amplifiers (LNAs) 390, one or moreswitches 392, one or more power amplifiers (PAs) 398, and one or morefilters 396 for transmitting and receiving RF signals.

In an aspect, the LNA 390 may amplify a received signal at a desiredoutput level. In an aspect, each of the LNAs 390 may have a specifiedminimum and maximum gain values. In an aspect, the RF front end 388 mayuse one or more switches 392 to select a particular LNA 390 and thespecified gain value based on a desired gain value for a particularapplication.

Further, for example, one or more PA(s) 398 may be used by the RF frontend 388 to amplify a signal for an RF output at a desired output powerlevel. In an aspect, each PA 398 may have specified minimum and maximumgain values. In an aspect, the RF front end 388 may use one or moreswitches 392 to select a particular PA 398 and the specified gain valuebased on a desired gain value for a particular application.

Also, for example, one or more filters 396 may be used by the RF frontend 388 to filter a received signal to obtain an input RF signal.Similarly, in an aspect, for example, a respective filter 396 may beused to filter an output from a respective PA 398 to produce an outputsignal for transmission. In an aspect, each filter 396 may be coupledwith a specific LNA 390 and/or PA 398. In an aspect, the RF front end388 may use one or more switches 392 to select a transmit or receivepath using a specified filter 396, the LNA 390, and/or the PA 398, basedon a configuration as specified by the transceiver 302 and/or theprocessor 312.

As such, the transceiver 302 may be configured to transmit and receivewireless signals through one or more antennas 365 via the RF front end388. In an aspect, transceiver may be tuned to operate at specifiedfrequencies such that the base station 105 may communicate with, forexample, the UE 110 or one or more cells associated with one or morebase station 105. In an aspect, for example, the modem 140 may configurethe transceiver 302 to operate at a specified frequency and power levelbased on the base station configuration of the base station 105 and thecommunication protocol used by the modem 140.

In an aspect, the modem 140 may be a multiband-multimode modem, whichmay process digital data and communicate with the transceiver 302 suchthat the digital data is sent and received using the transceiver 302. Inan aspect, the modem 140 may be multiband and be configured to supportmultiple frequency bands for a specific communications protocol. In anaspect, the modem 140 may be multimode and be configured to supportmultiple operating networks and communications protocols. In an aspect,the modem 140 may control one or more components of the base station 105(e.g., RF front end 388, transceiver 302) to enable transmission and/orreception of signals from the network based on a specified modemconfiguration. In an aspect, the modem configuration may be based on themode of the modem 140 and the frequency band in use. In another aspect,the modem configuration may be based on a base station configurationassociated with the base station 105.

Referring to FIGS. 4-8 , examples of communications between the UE 110,an MN 402, and an SN 404 are disclosed. In these examples, the UE 110may initially be in dual connectivity with the MN 402 and the SN 404. Inthese examples, the MN 402 includes an MCG having a set of cellscommunicatively coupled to the MN 402, and the SN 404 includes an SCGhaving a set of cells communicatively coupled to the SN 404. Further,for these examples, the SCG has entered a dormancy state with the UE 110but the MCG is in an active communication state with the UE 110. Asdescribed herein, the SCG may be dormant, for example, to preserve poweron the UE 110, for certain traffic types (e.g., VOIP), or for any otherreasoning.

Turning to FIG. 4 , an example beam failure procedure 400 includingcommunications between the UE 110 and the SN 404 without the use of theMN 402, is provided. The UE 110 may determine that the SCG is in adormant SCG state 410 based on, for example, receiving a message fromthe MN 402 indicating the SCG dormancy, a dormancy SCG setting (e.g.,dormancy bit), or any other method for determining a dormancy state.

When the SCG enters the dormant SCG state 410, the UE 110 may trigger aBFD procedure 412 on the PSCell and/or the SCells of the SCG. In anexample, during the BFD procedure 412, the UE 110 may monitor the PSCellor the SCell. The BFD procedure 412 may look at one or more measurementsof the PSCell or the SCell made by the SN 404 and sent to the UE 110after the dormant SCG state 410. The measurements of the PScell or theSCell may be obtained, for example, via one or more reference signalsfrom the SN 404.

During the BFD procedure 412, the UE 110 may also compare themeasurements to one or more thresholds to determine whether a beamfailure is detected. For example one or more of an RSRP or SINR may becompared to one or more thresholds. If one or more of the thresholdsindicate a beam failure occurred, the UE 110 determines BFD 414 on thePSCell or the SCell occurred. In response to the detection of BFD 414,the UE 110 may perform a best DL beam procedure 416 for the UE 110 todetermine a best DL beam to communicate with the SN 404. In an example,the UE 404 may determine the best DL beam from a plurality of DL beamsof the SCG based on one or more of the measurements from the SN 404. Anexample of a best DL beam may include a DL beam for the plurality of DLbeams having, for example, the signal power greater than signal powersof other DL beams of the plurality of DL beams.

Further in response to the detection of BFD 414, the UE 110 may alsotransmit a RACH message 418 to the SN 404 on the PSCell. The RACHmessage 418 may include a BFD report and in some examples, a best beamidentification identifying the best DL beam 416 for the SN 404 tocommunicate with the UE 110.

While use of the RACH message 418 through the PSCell may allow the SN404 to perform beam failure recovery (BFR), use of the DL beam may berisky as the UL beam may have failed. Also, sending the RACH message 418may be contention based (e.g., competing with other UEs RACH messages)or non-contention based. In the case of a contention based RACH, the UE110 may send a preamble to the SN 404 to allow the RACH procedure to bemore likely to work, than if the preamble is not sent. In an example,the SN 404 may designate the preamble to the UE 110 prior to the SCGentering the dormant SCG state 410 thereby providing a more directconnection for the UE 110 to communicate with the SN 404 via a RACHprocedure.

Turning to FIG. 5 , an example beam failure procedure 500 includingcommunications between the UE 110 and the SN 404 through the MN 402 isprovided. As the dormant SCG state 410, the BFD procedure 412, the BFD414, and best DL beam procedure 416 have been previously described.

In response to the detection of BFD 414, the UE 110 may transmit a BFDmessage 502 to the MN 402 using the MCG. In an example, the BFD message502 may include a BFD report indicating the beam failure of the PSCelland/or the SCell along with a request to the MN 402 to forward the BFDreport to the SN 404. In another example, the BFD message 502 may alsoinclude the identification of the best DL beam for communicating withthe SN 404 identified through the best DL beam procedure 416.

In response to the BFD message 502, the MN 402 may forward the BFDmessage 504 including the BFD report and, in some examples, theidentification of the best DL beam to the SN 404.

Based on the BFD report, the SN 404 may perform a BFR decision 506 todetermine whether to perform BFR of the PSCell or the SCell. In anexample, the SN 404 may determine to transition the SCG to an active SCGstate based on, for example, communication needs (e.g., UE 110 has datato transmit or expects to receive data) of the UE 110. In this example,the SN 404 may determine to perform BFR with the UE 110.

In response to the BFR decision 506 of performing the BFR, the SN 404may transmit a BFR message 508 to the MN 402. The BFR message 508 mayinclude an indication of BFR resources, such as RACH resources, for theUE 110 to communicate with the SN 404. The BFR message 508 may alsoinclude a request to the MN 402 to forward the BFR message 508 to the UE110.

In response to the BFR message 508, the MN 402 may forward the BFRmessage 510 including the indication of the BFR resources to the UE 110.

In response to the BFR message 510 and based on the BFR resourcesindicated by the SN 404, the UE 110 may transmit a RACH message 512 tothe SN 404 to perform the BFR.

In an example, each of the BFD message 502, the BFD message 504, the BFRmessage 508, and the BFR message 510 may be transmitted in one or moreof an RRC message, a MAC CE message, or a DCI message.

Turning to FIG. 6 , another example beam failure procedure 600 includingcommunications between the UE 110 and the SN 404 through the MN 402 isprovided. As the BFD message 502 and the BFD message 504 have beenpreviously described.

As previously indicated, based on the BFD report, the SN 404 may performa BFR decision 506 to determine whether to perform BFR of the PSCell orthe SCell. As the SCG is dormant, there may not be a need for the SCG totransition to an active SCG state. For example, the UE 110 may be usinga particular type of communication (e.g., VOIP) that does not use theSCG, or the UE 110 may be overheating. In this example, the SN 404 maydetermine not to perform BFR with the UE 110.

Therefore, in response to the BFR decision 506 of not performing theBFR, the SN 404 may transmit a BFR message 602 to the MN 402. The BFRmessage 602 may include an indication of not performing the BFR and arequest to the MN 402 to forward the BFR message 508 to the UE 110. Inan example, the indication may be one or more bits indicating thedecision of the SN 404. In response to the BFR message 602, the MN 402may forward the BFR message 604 including the indication of notperforming the BFR to the UE 110. In this example, in response to the UE110 receiving the indication of not performing the BFR, the SCG remainsin a dormant SCG state thereby the UE 110 does not communicate via theSCG.

In an example, each of the BFR message 602 and the BFR message 604 maybe transmitted in one or more of an RRC message, a MAC CE message, or aDCI message.

Turning to FIG. 7 , an example RLF recovery procedure 700 includingcommunications between the UE 110 and the SN 404 through the MN 402 isprovided. As the dormant SCG state 410 has been previously described,further details are not provided in this example.

When the SCG enters the dormant SCG state 410, the UE 110 may trigger aRLF procedure 702 on the PSCell of the SCG. In an example, during theRLF procedure 702, the UE 110 may monitor the PSCell. The RLF procedure702 may look at one or more measurements of the PSCell made by the SN404 and sent to the UE 110 after the dormant SCG state 410. Themeasurements of the PScell may be obtained, for example, via one or morereference signals from the SN 404.

During the RLF procedure 702, the UE 110 may also compare themeasurements to one or more thresholds to determine whether a RLF isdetected. For example, one or more of an RSRP or an SINR may be comparedto one or more thresholds. If one or more of the thresholds indicate aRLF occurred, the UE 110 determines RLF 704 on the PSCell occurred.

In response to the detection of RLF 704, the UE 110 may transmit an RLFmessage 706 to the MN 402 using the MCG. In an example, the RLF message706 may include an RLF report indicating the RLF of the PSCell alongwith a request to the MN 402 to forward the RLF report to the SN 404. Inresponse to the RLF message 706, the MN 402 may forward RLF message 708including the RLF report to the SN 404.

Based on the RLF report, the SN 404 may perform an RLF decision 710 todetermine whether to perform RLF of the PSCell. In an example, the SN404 may determine to transition the SCG to an active SCG state based on,for example, communication needs (e.g., UE 110 has data to transmit orexpects to receive data) of the UE 110. In this example, the SN 404 maydetermine not to perform RLF recovery with the UE 110.

Therefore, in response to the RLF decision 710 of not performing the RLFrecovery, the SN 404 may transmit a no change message 712 to the MN 402.The no change message 712 may include an indication of not performingthe RLF recovery and a request to the MN 402 to forward the no changemessage 712 to the UE 110. In an example, the indication may be one ormore bits indicating the no change decision of the SN 404. In responseto the no change message 712, the MN 402 may forward no change message714 including the indication of not performing the RLF recovery to theUE 110. In this example, in response to the UE 110 receiving theindication of not performing the RLF recovery, the SCG remains in adormant SCG state thereby the UE 110 does not communicate via the SCG.

In an example, each of the RLF message 706, the RLF message 708, the nochange message 712, and the no change message 712 may be transmitted inone or more of an RRC message, a MAC CE message, or a DCI message.

Turning to FIG. 8 , an example RLF recovery procedure 800 includingcommunications between the UE 110 and the SN 404 through the MN 402 isprovided. As the dormant SCG state 410, the RLF procedure 702, the RLF704, the RLF message 706, the RLF message 708, and RLF decision 710 havebeen previously described, further details are not provided in thisexample.

As previously described, based on the RLF report, the SN 404 may performthe RLF decision 710 to determine whether to perform RLF of the PSCell.In an example, the SN 404 may determine to transition the SCG to anactive SCG state based on, for example, communication needs (e.g., UE110 has data to transmit or expects to receive data) of the UE 110. Inthis example, the SN 404 may determine to perform the RLF recovery withthe UE 110.

Therefore, in response to the RLF decision 710 of performing the RLFrecovery, the SN 404 may transmit a SCell trigger message 802 to the MN402. The SCell trigger message 802 may include SCell measurementsrequest for the UE 110 to perform measurements of the SCells. The SCelltrigger message 802 may also include a request to the MN 402 to forwardthe SCell trigger message 802 to the UE 110. In response to the SCelltrigger message 802, the MN 402 may forward SCell trigger message 804including the SCell measurements request to the UE 110.

In response to the UE 110 receiving the SCell trigger message 804, theUE 110 may perform measurements (e.g., RSRP or SINR) of one or moreSCells to determine whether the PSCell can be replaced by an SCell.

The UE 110 may transmit a measurement message 808 to the MN 402indicating results of the measurements of the one or more SCells alongwith a request to the MN 402 to forward the measurement message 808 tothe SN 404. In response to the measurement message 808, the MN 402 mayforward measurement message 810 including the results of the SCellmeasurements to the SN 404.

In an example, the SN 404 may review the results of the SCellmeasurements and make a determination 812 to replace the PSCell with anSCell. In an example, the SN 404 may make the determination 812 toreplace the PSCell with the SCell by selecting the SCell based on themeasurements indicating the SCell having, for example, a higher signalpower than the PSCell.

Therefore, in response to the determination 812 to replace the PSCell,the SN 404 may transmit a replacement message 814 to the MN 402. Thereplacement message 814 may include an indication of the SCell the UE110 should use to replace the PSCell along with a request to the MN 402to forward the replacement message 814 to the UE 110. In an example, theindication of the SCell may include an identification of the SCellselected by the SN 404. In response to the replacement message 814, theMN 402 may forward replacement message 816 including the indication ofthe selected SCell to replace the PSCell to the UE 110.

The UE 110 may receive the replacement message 816 and change the SCellto the new PSCell 818. For example, the UE 110 may store theidentification of the SCell as the PSCell for future communications.Once the new PSCell is stored, the UE 110 may transmit a RACH message onthe new PSCell to the SN 404 for RLF recovery.

In an example, each of the SCell trigger message 802, the SCell triggermessage 804, the measurement message 808, the measurement message 810,the replacement message 814, and the replacement message 816 may betransmitted in one or more of an RRC message, a MAC CE message, or a DCImessage.

Referring to FIG. 9 , an example of a method 900 for performing recoveryof SCG while in a dormant SCG state may be performed by the SCG dormancymanagement component 146, the modem 144, the processor 212, and/or thememory 216 of the UE 110 of the wireless communication network 100.

At block 902, the method 900 may include determining the UE has entereda dormant state with respect to an SCG of an SN having a PSCell and oneor more SCells. For example, the SCG dormancy management component 146,the modem 144, the processor 212, and/or one or more additionalcomponents/subcomponents of the UE 110 may determine the UE 110 hasentered a dormant SCG state 410 with respect to the SCG of the SN 404having the PSCell and one or more SCells, as illustrated by FIGS. 4-8 .In an example, determination of the dormant state may be based on amessage from the SN 404 or a dormancy state setting (e.g., dormancy bit)indicating the dormancy state.

In certain implementations, the processor 212, the modem 144, the SCGdormancy management component 146, and/or one or more other componentsor subcomponents of the UE 110 may be configured to and/or may definemeans for determining the UE has entered a dormant state with respect toan SCG of an SN having a PSCell and one or more SCells.

At block 904, the method 900 may include monitoring the SCG to detect aradio link failure on the PSCell or a beam failure on one of the PSCellor an SCell of the one or more SCells, while the UE is in the dormantstate with respect to the SCG. For example, the SCG dormancy managementcomponent 146, the modem 144, the processor 212, and/or one or moreother components or subcomponents of the UE 110 may perform the BFDprocedure 412 of FIGS. 4-6 or the RLF procedure 702 of FIGS. 7 and 8 tomonitor the SCG to detect the RLF 704 on the PSCell or the beam failure414 on one of the PSCell or the SCell while the UE 110 is in the dormantSCG state 410 with respect to the SCG.

In certain implementations, the processor 212, the modem 144, the SCGdormancy management component 146, the transceiver 202, the receiver206, the transmitter 208, the RF front end 288, and/or the subcomponentsof the RF front end 288 may be configured to and/or may define means formonitoring the SCG to detect a radio link failure on the PSCell or abeam failure on one of the PSCell or an SCell of the one or more SCells,while the UE is in the dormant state with respect to the SCG.

At block 906, the method 900 may include transmitting, to the SN, areport based on the radio link failure or the beam failure beingdetected. For example, the SCG dormancy management component 146, themodem 144, the processor 212, the transceiver 202, and/or one or moreother components or subcomponents of the UE 110 may transmit, to the SN404, the RACH message 418 of FIG. 4 , the BFD message 502 of FIGS. 5 and6 , or the RLF message 706 of FIGS. 7 and 8 including a report based onthe beam failure 414 or the RLF 704 being detected.

In certain implementations, the processor 212, the modem 144, the SCGdormancy management component 146, the transceiver 202, the receiver206, the transmitter 208, the RF front end 288, and/or the subcomponentsof the RF front end 288 may be configured to and/or may define means fortransmitting, to the SN, a report based on the radio link failure or thebeam failure being detected.

In an example, the transmitting of the report may comprise transmitting,to the SN on the PSCell, an RACH message including the report inresponse to the beam failure being detected. The SCG dormancy managementcomponent 146, the modem 144, the processor 212, and/or one or moreother components or subcomponents of the UE 110 may transmit, to the SN404 on the PSCell, the RACH message 418 of FIG. 4 including the reportin response to the beam failure 414 being detected. In certainimplementations, the processor 212, the modem 144, the SCG dormancymanagement component 146, the transceiver 202, the receiver 206, thetransmitter 208, the RF front end 288, and/or the subcomponents of theRF front end 288 may be configured to and/or may define means fortransmitting, to the SN on the PSCell, an RACH message including thereport in response to the beam failure being detected.

In an example, the method 800 may also include determining a best DLbeam for the PSCell or the SCell of the SCG for communicating with theSN in response to the beam failure being detected on the PSCell or theSCell; and transmitting, to the SN, an indication of the DL beam forcommunication with the UE. In another example, the SCG dormancymanagement component 146, the modem 144, the processor 212, and/or oneor more other components or subcomponents of the UE 110 may determine abest DL beam 416 of FIGS. 4-6 for the PSCell or the SCell of the SCG forcommunicating with the SN 404 in response to the beam failure 414 ofFIGS. 4-6 being detected on the PSCell or the SCell; and transmit, tothe SN 404, an indication (in the BFD message 502 of FIG. 5 ) of the DLbeam for communication with the UE 110. In certain implementations, theprocessor 212, the modem 144, the SCG dormancy management component 146,the transceiver 202, the receiver 206, the transmitter 208, the RF frontend 288, and/or the subcomponents of the RF front end 288 may beconfigured to and/or may define means for determining a best DL beam forthe PSCell or the SCell of the SCG for communicating with the SN inresponse to the beam failure being detected on the PSCell or the SCell;and transmitting, to the SN 404, an indication of the DL beam forcommunication with the UE.

In an example, the method 900 may also include transmitting the reportto an MN having an MCG along with instructions to forward the report tothe SN. In another example, the SCG dormancy management component 146,the modem 144, the processor 212, and/or one or more other components orsubcomponents of the UE 110 may transmit the report (e.g., BFD message502 of FIGS. 5 and 6 , RLF message 706 of FIGS. 7 and 8 ) to MN 402having the MCG along with instructions to forward the report to the SN404. In certain implementations, the processor 212, the modem 144, theSCG dormancy management component 146, the transceiver 202, the receiver206, the transmitter 208, the RF front end 288, and/or the subcomponentsof the RF front end 288 may be configured to and/or may define means fortransmitting the report to the MN 402 having the MCG along withinstructions to forward the report to the SN.

In an example, the report may be transmitted via one of a RRC message, aMAC CE message, or a DCI message.

In an example, the method 900 may also include receiving, from the SNvia the MN in response to the transmitting of the report, an indicationof resources for a BFR procedure on the SCG. In another example, the SCGdormancy management component 146, the modem 144, the processor 212,and/or one or more other components or subcomponents of the UE 110 mayreceive, from the SN 404 via the MN 402 in response to the transmittingof the report (e.g., BFD message 502 of FIGS. 5 and 6 , RLF message 706of FIGS. 7 and 8 ), an indication of resources (e.g., RACH resources)for a BFR procedure on the SCG. In certain implementations, theprocessor 212, the modem 144, the SCG dormancy management component 146,the transceiver 202, the receiver 206, the transmitter 208, the RF frontend 288, and/or the subcomponents of the RF front end 288 may beconfigured to and/or may define means for receiving, from the SN 404 viathe MN 402 in response to the transmitting of the report, an indicationof resources for a BFR procedure on the SCG.

In an example, the method 900 may also include communicating with the SNthrough a RACH message on the PSCell in response to the receiving of theindication of resources for the BFR procedure on the PSCell or the SCellof the SCG. In another example, the SCG dormancy management component146, the modem 144, the processor 212, and/or one or more othercomponents or subcomponents of the UE 110 may communicate with the SN404 through the RACH message (e.g., RACH message 418 of FIG. 4 , RACHmessage 512 of FIG. 5 ) on the PSCell in response to the receiving ofthe indication of resources for the BFR procedure on the PSCell or theSCell of the SCG. In certain implementations, the processor 212, themodem 144, the SCG dormancy management component 146, the transceiver202, the receiver 206, the transmitter 208, the RF front end 288, and/orthe subcomponents of the RF front end 288 may be configured to and/ormay define means for communicating with the SN through an RACH messageon the PSCell in response to the receiving of the indication ofresources for the BFR procedure on the PSCell or the SCell of the SCG.

In an example, the method 900 may also include receiving, from the SNvia the MN in response to the transmitting of the report, an indicationthat no BFR procedure on the SCG will be performed. In another example,the SCG dormancy management component 146, the modem 144, the processor212, and/or one or more other components or subcomponents of the UE 110may receive, from the SN 404 via the MN 402 in response to thetransmitting of the report, an indication that no BFR procedure (e.g.,BFR message 604 of FIG. 6 ) on the SCG will be performed. In certainimplementations, the processor 212, the modem 144, the SCG dormancymanagement component 146, the transceiver 202, the receiver 206, thetransmitter 208, the RF front end 288, and/or the subcomponents of theRF front end 288 may be configured to and/or may define means forreceiving, from the SN 404 via the MN 402 in response to thetransmitting of the report, an indication that no BFR procedure on theSCG will be performed.

In an example, the method 900 may also include receiving, from the SN404 via the MN 402 in response to the transmitting of the report, anindication for the UE 110 to remain in a RLF state on the PSCell. Inanother example, the SCG dormancy management component 146, the modem144, the processor 212, and/or one or more other components orsubcomponents of the UE 110 may receive, from the SN 404 via the MN 402in response to the transmitting of the report, an indication (e.g., nochange message 712 of FIG. 7 ) for the UE 110 to remain in a RLF stateon the PSCell. In certain implementations, the processor 212, the modem144, the SCG dormancy management component 146, the transceiver 202, thereceiver 206, the transmitter 208, the RF front end 288, and/or thesubcomponents of the RF front end 288 may be configured to and/or maydefine means for receiving, from the SN 404 via the MN 402 in responseto the transmitting of the report, an indication for the UE 110 toremain in a RLF state on the PSCell.

In an example, the method 900 may also include receiving, from the SN404 via the MN 402 in response to the transmitting of the report, firstinstructions to perform one or more measurements on the one or moreSCells of the SCG. In another example, the SCG dormancy managementcomponent 146, the modem 144, the processor 212, and/or one or moreother components or subcomponents of the UE 110 may receive, from the SN404 via the MN 402 in response to the transmitting of the report, firstinstructions (e.g., SCell trigger message 802 of FIG. 8 ) to perform oneor more measurements on the one or more SCells of the SCG. In certainimplementations, the processor 212, the modem 144, the SCG dormancymanagement component 146, the transceiver 202, the receiver 206, thetransmitter 208, the RF front end 288, and/or the subcomponents of theRF front end 288 may be configured to and/or may define means forreceiving, from the SN 404 via the MN 402 in response to thetransmitting of the report, first instructions to perform one or moremeasurements on the one or more SCells of the SCG.

In an example, the method 900 may also include performing the one ormore measurements on the one or more SCells in response to receiving ofthe instructions; and transmitting, to the SN 404 via the MN 402, ameasurement report. In another example, the SCG dormancy managementcomponent 146, the modem 144, the processor 212, and/or one or moreother components or subcomponents of the UE 110 may perform the one ormore measurements 806 on the one or more SCells in response to receivingof the first instructions; and transmit, to the SN 404 via the MN 402, ameasurement report (e.g., measurement message 808). In certainimplementations, the processor 212, the modem 144, the SCG dormancymanagement component 146, the transceiver 202, the receiver 206, thetransmitter 208, the RF front end 288, and/or the subcomponents of theRF front end 288 may be configured to and/or may define means forperforming the one or more measurements on the one or more SCells inresponse to receiving of the instructions; and transmitting, to the SN404 via the MN 402, a measurement report.

In an example, the method 900 may also include receiving, from the SN404 via the MN 404, second instructions to update the PSCell to aselected SCell of the one or more SCells in response to the transmittingof the measurement report. In another example, the SCG dormancymanagement component 146, the modem 144, the processor 212, and/or oneor more other components or subcomponents of the UE 110 may receive,from the SN 404 via the MN 402, second instructions (e.g., replacementmessage 814) to update the PSCell to a selected SCell of the one or moreSCells in response to the transmitting of the measurement report. Incertain implementations, the processor 212, the modem 144, the SCGdormancy management component 146, the transceiver 202, the receiver206, the transmitter 208, the RF front end 288, and/or the subcomponentsof the RF front end 288 may be configured to and/or may define means forreceiving, from the SN 404 via the MN 402, second instructions to updatethe PSCell to a selected SCell of the one or more SCells in response tothe transmitting of the measurement report.

In an example, the method 900 may also include transmitting an RACHmessage on the selected SCell. In another example, the SCG dormancymanagement component 146, the modem 144, the processor 212, and/or oneor more other components or subcomponents of the UE 110 may transmit theRACH message 820 on the new PSCell which is the selected SCell. Incertain implementations, the processor 212, the modem 144, the SCGdormancy management component 146, the transceiver 202, the receiver206, the transmitter 208, the RF front end 288, and/or the subcomponentsof the RF front end 288 may be configured to and/or may define means fortransmitting an RACH message on the selected SCell.

Referring to FIG. 10 , an example of a method 1000 for performing arecovery procedure during a dormant SCG state may be performed by theSCG recovery component 142, the modem 140, the processor 312, the memory316, and/or one or more additional components/subcomponents of the basestation 105 in the wireless communication network 100.

At block 1002, the method 1000 may include receiving, from the UE, areport based on a radio link failure being detected on the PSCell or abeam failure being detected on one of the PSCell or an SCell of one ormore SCells of the SCG, in response to the UE being in a dormant statewith respect to the SCG. For example, the SCG recovery component 142,the modem 140, the processor 312, the memory 316, and/or one or morecomponents/subcomponents of the base station 105 may receive, from theUE 110, a report (e.g., RACH message 418 of FIG. 4 , BFD message 502 ofFIGS. 5 and 6 , RLF message 708 of FIGS. 7 and 8 ) based on a RLF beingdetected (e.g., RLF 702 of FIGS. 7 and 8 ) on the PSCell or the beamfailure (e.g., BFD 414 of FIGS. 4-6 ) on the PSCell or an SCell, inresponse to the UE 110 being in a dormant state with respect to the SCG.

In certain implementations, the processor 312, the modem 140, the SCGrecovery component 142, the transceiver 302, the receiver 306, thetransmitter 308, the RF front end 388, and/or the subcomponents of theRF front end 388 may be configured to and/or may define means forreceiving, from the UE, a report based on a radio link failure beingdetected on the PSCell or a beam failure being detected on one of thePSCell or an SCell of one or more SCells of the SCG, in response to theUE being in a dormant state with respect to the SCG.

In some examples, the report may be received in an RACH message on thePSCell. In some examples, the report may include an indication of a bestDL beam for the PSCell or the SCell of the SCG for communicating withthe UE in response to the beam failure being detected on the PSCell orthe SCell. The indication may include an identification of the DL beamfor the PSCell or the SCell. In some examples, the report may bereceived from an MN having an MCG. In some examples, the report may bereceived via one of an RRC message, an MAC CE message, or a DCI message.

At block 1004, the method 1000 may include determining to perform arecovery procedure with the UE or to not perform the recovery procedurein response to the report. For example, the SCG recovery component 142,the modem 140, and/or the processor 312 of the base station 105 maydetermine (e.g., BFR decision 506 of FIGS. 5 and 6 , RLF decision 710 ofFIGS. 7 and 8 ) to perform a recovery procedure with the UE 110 or tonot perform the recovery procedure in response to the report.

In certain implementations, the processor 312, the modem 140, the SCGrecovery component 142, the transceiver 302, the receiver 306, thetransmitter 308, the RF front end 388, and/or the subcomponents of theRF front end 388 may be configured to and/or may define means fordetermining to perform a recovery procedure with the UE or to notperform the recovery procedure in response to the report.

At block 1006, the method 1000 may include transmitting, to the UE, anindication that the recovery procedure will be performed or to notperformed. For example, the SCG recovery component 142, the modem 140,and/or the processor 312 of the base station 105 may transmit, to the UE110, an indication (e.g., BFR message 510 or 604 of FIGS. 5 and 6 , nochange message 712 or SCell trigger message 802 of FIGS. 7 and 8 ) thatthe recovery procedure will be performed or to not performed.

In certain implementations, the processor 312, the modem 140, the SCGrecovery component 142, the transceiver 302, the receiver 306, thetransmitter 308, the RF front end 388, and/or the subcomponents of theRF front end 388 may be configured to and/or may define means fordetermining to perform a recovery procedure with the UE or to notperform the recovery procedure in response to the report.

In an example, the method 1000 may also include transmitting, to the UEvia the MN in response to the receiving of the report, an indication ofresources for the recovery procedure on the SCG, wherein the recoveryprocedure is a BFR procedure, and wherein the report includes anindication of the beam failure being detected on the PSCell or theSCell. For example, the SCG recovery component 142, the modem 140,and/or the processor 312 of the base station 105 may transmit, to the UE110 via the MN 402 in response to the receiving of the report, anindication of resources for the recovery procedure on the SCG, whereinthe recovery procedure is a BFR procedure, and wherein the reportincludes an indication of the beam failure being detected on the PSCellor the SCell. In certain implementations, the processor 312, the modem140, the SCG recovery component 142, the transceiver 302, the receiver306, the transmitter 308, the RF front end 388, and/or the subcomponentsof the RF front end 388 may be configured to and/or may define means fortransmitting, to the UE 110 via the MN 402 in response to the receivingof the report, an indication of resources for the recovery procedure onthe SCG, wherein the recovery procedure is a BFR procedure, and whereinthe report includes an indication of the beam failure being detected onthe PSCell or the SCell.

In an example, the method 1000 may also include communicating with theUE through an RACH message on the PSCell in response to the transmittingof the indication of resources for the BFR procedure on the SCG. Forexample, the SCG recovery component 142, the modem 140, and/or theprocessor 312 of the base station 105 may communicate with the UEthrough an RACH message on the PSCell in response to the transmitting ofthe indication of resources for the BFR procedure on the SCG. In certainimplementations, the processor 312, the modem 140, the SCG recoverycomponent 142, the transceiver 302, the receiver 306, the transmitter308, the RF front end 388, and/or the subcomponents of the RF front end388 may be configured to and/or may define means for communicating withthe UE through an RACH message on the PSCell in response to thetransmitting of the indication of resources for the BFR procedure on theSCG.

In an example, the method 1000 may also include transmitting, to the UEvia the MN in response to the receiving of the report, the indicationthat the recovery procedure will not be performed, wherein the recoveryprocedure is a BFR procedure on the SCG, wherein the report includes anindication of the beam failure being detected on the PSCell or theSCell. For example, the SCG recovery component 142, the modem 140,and/or the processor 312 of the base station 105 may transmit, to the UE110 via the MN 402 in response to the receiving of the report, theindication that the recovery procedure will not be performed, whereinthe recovery procedure is a BFR procedure on the SCG, wherein the reportincludes an indication of the beam failure being detected on the PSCellor the SCell. In certain implementations, the processor 312, the modem140, the SCG recovery component 142, the transceiver 302, the receiver306, the transmitter 308, the RF front end 388, and/or the subcomponentsof the RF front end 388 may be configured to and/or may define means fortransmitting, to the UE 110 via the MN 402 in response to the receivingof the report, the indication that the recovery procedure will not beperformed, wherein the recovery procedure is a BFR procedure on the SCG,wherein the report includes an indication of the beam failure beingdetected on the PSCell or the SCell.

In an example, the method 1000 may also include transmitting, to the UEvia the MN, the indication that the recovery procedure will not beperformed, in response to the receiving of the report, wherein therecovery procedure is a radio link recovery procedure on the SCG,wherein the report includes an indication of the radio link failurebeing detected. For example, the SCG recovery component 142, the modem140, and/or the processor 312 of the base station 105 may transmit, tothe UE 110 via the MN 402, the indication that the recovery procedurewill not be performed, in response to the receiving of the report,wherein the recovery procedure is a radio link recovery procedure on theSCG, wherein the report includes an indication of the radio link failurebeing detected. In certain implementations, the processor 312, the modem140, the SCG recovery component 142, the transceiver 302, the receiver306, the transmitter 308, the RF front end 388, and/or the subcomponentsof the RF front end 388 may be configured to and/or may define means fortransmitting, to the UE 110 via the MN 402, the indication that therecovery procedure will not be performed, in response to the receivingof the report, wherein the recovery procedure is a radio link recoveryprocedure on the SCG, wherein the report includes an indication of theradio link failure being detected.

In an example, the method 1000 may also include transmitting, to the UEvia the MN, first instructions to perform one or more measurements onthe one or more SCells of the SCG in response to the receiving of thereport, wherein the report includes an indication of the radio linkfailure being detected. For example, the SCG recovery component 142, themodem 140, and/or the processor 312 of the base station 105 maytransmit, to the UE 110 via the MN 402, first instructions to performone or more measurements on the one or more SCells of the SCG inresponse to the receiving of the report, wherein the report includes anindication of the radio link failure being detected. In certainimplementations, the processor 312, the modem 140, the SCG recoverycomponent 142, the transceiver 302, the receiver 306, the transmitter308, the RF front end 388, and/or the subcomponents of the RF front end388 may be configured to and/or may define means for transmitting, tothe UE 110 via the MN 402, first instructions to perform one or moremeasurements on the one or more SCells of the SCG in response to thereceiving of the report, wherein the report includes an indication ofthe radio link failure being detected.

In an example, the method 1000 may also include receiving, from the UEvia the MN, a measurement report in response to the transmitting of thefirst instructions. For example, the SCG recovery component 142, themodem 140, and/or the processor 312 of the base station 105 may receive,from the UE 110 via the MN 402, a measurement report in response to thetransmitting of the first instructions. In certain implementations, theprocessor 312, the modem 140, the SCG recovery component 142, thetransceiver 302, the receiver 306, the transmitter 308, the RF front end388, and/or the subcomponents of the RF front end 388 may be configuredto and/or may define means for receiving, from the UE 110 via the MN402, a measurement report in response to the transmitting of the firstinstructions.

In an example, the method 1000 may also include transmitting, to the UEvia the MN, second instructions to update the PSCell to a selected SCellof the one or more SCells in response to the receiving of themeasurement report. For example, the SCG recovery component 142, themodem 140, and/or the processor 312 of the base station 105 maytransmit, to the UE 110 via the MN 402, second instructions to updatethe PSCell to a selected SCell of the one or more SCells in response tothe receiving of the measurement report. In certain implementations, theprocessor 312, the modem 140, the SCG recovery component 142, thetransceiver 302, the receiver 306, the transmitter 308, the RF front end388, and/or the subcomponents of the RF front end 388 may be configuredto and/or may define means for transmitting, to the UE 110 via the MN402, second instructions to update the PSCell to a selected SCell of theone or more SCells in response to the receiving of the measurementreport.

In an example, the method 1000 may also include receiving, from the UE,an RACH message on the selected SCell. For example, the SCG recoverycomponent 142, the modem 140, and/or the processor 312 of the basestation 105 may receive, from the UE 110, an RACH message on theselected SCell. In certain implementations, the processor 312, the modem140, the SCG recovery component 142, the transceiver 302, the receiver306, the transmitter 308, the RF front end 388, and/or the subcomponentsof the RF front end 388 may be configured to and/or may define means forreceiving, from the UE 110, an RACH message on the selected SCell.

Additional Implementations

-   -   1. An example method of wireless communication by a UE,        comprising: determining the UE has entered a dormant state with        respect to an SCG of an SN having a PSCell and one or more        SCells; monitoring the SCG to detect a radio link failure on the        PSCell or a beam failure on one of the PSCell or an SCell of the        one or more SCells, while the UE is in the dormant state with        respect to the SCG; and transmitting, to the SN, a report based        on the radio link failure or the beam failure being detected.

The above example method wherein the report includes an indication ofthe beam failure being detected, and wherein the transmitting of thereport comprises transmitting, to the SN on the PSCell, an RACH messageincluding the report in response to the beam failure being detected.

One or more of the above example methods further comprising: determininga best DL beam for the PSCell or the SCell of the SCG for communicatingwith the SN in response to the beam failure being detected on the PSCellor the SCell; and transmitting, to the SN, an indication of the DL beamfor communication with the UE.

One or more of the above example methods wherein the transmitting of thereport comprises transmitting the report to an MN having an MCG alongwith instructions to forward the report to the SN.

One or more of the above example methods wherein the transmitting thereport to the MN comprises transmitting the report via one of an RRCmessage, an MAC CE message, or a DCI message.

One or more of the above example methods wherein the report includes anindication of the beam failure being detected on the PSCell or theSCell, and wherein the method further comprises receiving, from the SNvia the MN in response to the transmitting of the report, an indicationof resources for a BFR procedure on the SCG.

One or more of the above example methods further comprising:communicating with the SN through an RACH message on the PSCell inresponse to the receiving of the indication of resources for the BFRprocedure on the PSCell or the SCell of the SCG.

One or more of the above example methods wherein the report includes anindication of the beam failure being detected on the PSCell or theSCell, and wherein the method further comprises receiving, from the SNvia the MN in response to the transmitting of the report, an indicationthat no BFR procedure on the SCG will be performed.

One or more of the above example methods wherein the report includes anindication of the radio link failure being detected, and wherein themethod further comprises receiving, from the SN via the MN in responseto the transmitting of the report, an indication for the UE to remain ina radio link failure state on the PSCell.

One or more of the above example methods wherein the report includes anindication of the radio link failure being detected, and wherein themethod further comprises receiving, from the SN via the MN in responseto the transmitting of the report, first instructions to perform one ormore measurements on the one or more SCells of the SCG.

One or more of the above example methods further comprising: performingthe one or more measurements on the one or more SCells in response toreceiving of the first instructions; and transmitting, to the SN via theMN, a measurement report.

One or more of the above example methods further comprising: receiving,from the SN via the MN, second instructions to update the PSCell to aselected SCell of the one or more SCells in response to the transmittingof the measurement report.

One or more of the above example methods further comprising:transmitting an RACH message on the selected SCell.

An example apparatus, comprising: a memory comprising instructions; andone or more processors communicatively coupled with the memory andconfigured to: perform all or a part of any of the above examplemethods.

An example computer readable medium having instructions stored thereinthat, when executed by one or more processors, cause the one or moreprocessors to: perform all or a part of any of the above examplemethods.

An example apparatus, comprising: means for performing all or a part ofany of the above example methods.

A second example method of wireless communication by an apparatus of aPSCell associated with an SCG, the method comprising: receiving, fromthe UE, a report based on a radio link failure being detected on thePSCell or a beam failure being detected on one of the PSCell or an SCellof one or more SCells of the SCG, in response to the UE being in adormant state with respect to the SCG; determining to perform a recoveryprocedure with the UE or to not perform the recovery procedure inresponse to the report; and transmitting, to the UE, an indication thatthe recovery procedure will be performed or not performed.

The above second example method wherein the receiving of the reportcomprises receiving the report in an RACH message on the PSCell.

One or more of the above second example methods wherein the receiving ofthe report comprises an indication of a best DL beam for the PSCell orthe SCell of the SCG for communicating with the UE in response to thebeam failure being detected on the PSCell or the SCell.

One or more of the above second example methods wherein the receiving ofthe report comprises receiving the report from an MN having an MCG.

One or more of the above second example methods wherein the receivingthe report from the MN comprises receiving the report via one of an RRCmessage, an MAC CE message, or a DCI message.

One or more of the above second example methods wherein the reportincludes an indication of the beam failure being detected on the PSCellor the SCell, and wherein the method further comprises transmitting, tothe UE via the MN in response to the receiving of the report, anindication of resources for the recovery procedure on the SCG, andwherein the recovery procedure is a BFR procedure.

One or more of the above second example methods further comprising:communicating with the UE through an RACH message on the PSCell inresponse to the transmitting of the indication of resources for the BFRprocedure on the SCG.

One or more of the above second example methods wherein the reportincludes an indication of the beam failure being detected on the PSCellor the SCell, and wherein the method further comprises transmitting, tothe UE via the MN in response to the receiving of the report, theindication that the recovery procedure will not be performed, whereinthe recovery procedure is a BFR procedure on the SCG.

One or more of the above second example methods wherein the reportincludes an indication of the radio link failure being detected, andwherein the method further comprises transmitting, to the UE via the MN,the indication that the recovery procedure will not be performed, inresponse to the receiving of the report, wherein the recovery procedureis a radio link recovery procedure on the SCG.

One or more of the above second example methods wherein the reportincludes an indication of the radio link failure being detected, andwherein the method further comprises transmitting, to the UE via the MN,first instructions to perform one or more measurements on the one ormore SCells of the SCG in response to the receiving of the report.

One or more of the above second example methods further comprising:receiving, from the UE via the MN, a measurement report in response tothe transmitting of the first instructions.

One or more of the above second example methods further comprising:transmitting, to the UE via the MN, second instructions to update thePSCell to a selected SCell of the one or more SCells in response to thereceiving of the measurement report.

One or more of the above second example methods further comprising:receiving, from the UE, an RACH message on the selected SCell.

An example apparatus, comprising: a memory comprising instructions; andone or more processors communicatively coupled with the memory andconfigured to: perform all or a part of any of the above second examplemethods.

An example computer readable medium having instructions stored thereinthat, when executed by one or more processors, cause the one or moreprocessors to: perform all or a part of any of the above second examplemethods.

An example apparatus, comprising: means for performing all or a part ofany of the above second example methods.

The above detailed description set forth above in connection with theappended drawings describes examples and does not represent the onlyexamples that may be implemented or that are within the scope of theclaims. The term “example,” when used in this description, means“serving as an example, instance, or illustration,” and not “preferred”or “advantageous over other examples.” The detailed description includesspecific details for the purpose of providing an understanding of thedescribed techniques. These techniques, however, may be practicedwithout these specific details. For example, changes may be made in thefunction and arrangement of elements discussed without departing fromthe scope of the disclosure. Also, various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in other examples. In some instances, well-known structures andapparatuses are shown in block diagram form in order to avoid obscuringthe concepts of the described examples.

It should be noted that the techniques described herein may be used forvarious wireless communication networks such as CDMA, TDMA, FDMA, OFDMA,SC-FDMA, and other systems. The terms “system” and “network” are oftenused interchangeably. A CDMA system may implement a radio technologysuch as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc.CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases 0and A are commonly referred to as CDMA2000 1×, 1×, etc. IS-856 (TIA-856)is commonly referred to as CDMA2000 1×EV-DO, High Rate Packet Data(HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants ofCDMA. A TDMA system may implement a radio technology such as GlobalSystem for Mobile Communications (GSM). An OFDMA system may implement aradio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA(E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20,Flash-OFDM™, etc. UTRA and E-UTRA are part of Universal MobileTelecommunication System (UMTS). 3GPP LTE and LTE-Advanced (LTE-A) arenew releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A,and GSM are described in documents from an organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned above as well as other systemsand radio technologies, including cellular (e.g., LTE) communicationsover a shared radio frequency spectrum band. The description herein,however, describes an LTE/LTE-A system or 5G system for purposes ofexample, and LTE terminology is used in much of the description below,although the techniques may be applicable other next generationcommunication systems.

Information and signals may be represented using any of a variety ofdifferent technologies and techniques. For example, data, instructions,commands, information, signals, bits, symbols, and chips that may bereferenced throughout the above description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, computer-executable code or instructionsstored on a computer-readable medium, or any combination thereof.

The various illustrative blocks and components described in connectionwith the disclosure herein may be implemented or performed with aspecially-programmed device, such as but not limited to a processor, adigital signal processor (DSP), an ASIC, a FPGA or other programmablelogic device, a discrete gate or transistor logic, a discrete hardwarecomponent, or any combination thereof designed to perform the functionsdescribed herein. A specially-programmed processor may be amicroprocessor, but in the alternative, the processor may be anyconventional processor, controller, microcontroller, or state machine. Aspecially-programmed processor may also be implemented as a combinationof computing devices, e.g., a combination of a DSP and a microprocessor,multiple microprocessors, one or more microprocessors in conjunctionwith a DSP core, or any other such configuration.

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on anon-transitory computer-readable medium. Other examples andimplementations are within the scope and spirit of the disclosure andappended claims. For example, due to the nature of software, functionsdescribed above may be implemented using software executed by aspecially programmed processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations. Also, as used herein, including in the claims, “or” as usedin a list of items prefaced by “at least one of” indicates a disjunctivelist such that, for example, a list of “at least one of A, B, or C”means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

Computer-readable media includes both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. A storage medium may be anyavailable medium that may be accessed by a general purpose or specialpurpose computer. By way of example, and not limitation,computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM or otheroptical disk storage, magnetic disk storage or other magnetic storagedevices, or any other medium that may be used to carry or store desiredprogram code means in the form of instructions or data structures andthat may be accessed by a general-purpose or special-purpose computer,or a general-purpose or special-purpose processor. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a website, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include compact disc (CD), laser disc, optical disc, digital versatiledisc (DVD), floppy disk and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

The previous description of the disclosure is provided to enable aperson skilled in the art to make or use the disclosure. Variousmodifications to the disclosure will be readily apparent to thoseskilled in the art, and the common principles defined herein may beapplied to other variations without departing from the spirit or scopeof the disclosure. Furthermore, although elements of the describedaspects may be described or claimed in the singular, the plural iscontemplated unless limitation to the singular is explicitly stated.Additionally, all or a portion of any aspect may be utilized with all ora portion of any other aspect, unless stated otherwise. Thus, thedisclosure is not to be limited to the examples and designs describedherein but is to be accorded the widest scope consistent with theprinciples and novel features disclosed herein.

What is claimed is:
 1. A method of wireless communication by a userequipment (UE), comprising: determining the UE has entered a dormantstate with respect to a secondary cell group (SCG) of a secondary node(SN) having a primary SCG cell (PSCell) and one or more secondary cells(SCells); monitoring the SCG to detect a radio link failure on thePSCell or a beam failure on one of the PSCell or an SCell of the one ormore SCells, while the UE is in the dormant state with respect to theSCG; and transmitting, to the SN, a report based on the radio linkfailure or the beam failure being detected.
 2. The method of claim 1,wherein the report includes an indication of the beam failure beingdetected, and wherein the transmitting of the report comprisestransmitting, to the SN on the PSCell, a random access channel (RACH)message including the report in response to the beam failure beingdetected.
 3. The method of claim 1, further comprising: determining abest downlink (DL) beam for the PSCell or the SCell of the SCG forcommunicating with the SN in response to the beam failure being detectedon the PSCell or the SCell; and transmitting, to the SN, an indicationof the best DL beam for communication with the UE.
 4. The method ofclaim 1, wherein the transmitting of the report comprises transmittingthe report to a master node (MN) having a master cell group (MCG) alongwith instructions to forward the report to the SN.
 5. The method ofclaim 4, wherein the transmitting the report to the MN comprisestransmitting the report via one of a radio resource control (RRC)message, a media access control control element (MAC CE) message, or adownlink control information (DCI) message.
 6. The method of claim 4,wherein the report includes an indication of the beam failure beingdetected on the PSCell or the SCell, and wherein the method furthercomprises receiving, from the SN via the MN in response to thetransmitting of the report, an indication of resources for a beamfailure recovery (BFR) procedure on the SCG.
 7. The method of claim 6,further comprising: communicating with the SN through a random accesschannel (RACH) message on the PSCell in response to the receiving of theindication of resources for the BFR procedure on the PSCell or the SCellof the SCG.
 8. The method of claim 4, wherein the report includes anindication of the beam failure being detected on the PSCell or theSCell, and wherein the method further comprises receiving, from the SNvia the MN in response to the transmitting of the report, an indicationthat no beam failure recovery (BFR) procedure on the SCG will beperformed.
 9. The method of claim 4, wherein the report includes anindication of the radio link failure being detected, and wherein themethod further comprises receiving, from the SN via the MN in responseto the transmitting of the report, an indication for the UE to remain ina radio link failure state on the PSCell.
 10. The method of claim 4,wherein the report includes an indication of the radio link failurebeing detected, and wherein the method further comprises receiving, fromthe SN via the MN in response to the transmitting of the report, firstinstructions to perform one or more measurements on the one or moreSCells of the SCG.
 11. The method of claim 10, further comprising:performing the one or more measurements on the one or more SCells inresponse to receiving of the first instructions; and transmitting, tothe SN via the MN, a measurement report.
 12. The method of claim 11,further comprising: receiving, from the SN via the MN, secondinstructions to update the PSCell to a selected SCell of the one or moreSCells in response to the transmitting of the measurement report. 13.The method of claim 12, further comprising: transmitting a random accesschannel (RACH) message on the selected SCell.
 14. A method of wirelesscommunication by an apparatus of a primary serving cell (PSCell)associated with a secondary cell group (SCG), the method comprising:receiving, from a user equipment (UE), a report based on a radio linkfailure being detected on the PSCell or a beam failure being detected onone of the PSCell or a secondary cell (SCell) of one or more SCells ofthe SCG, in response to the UE being in a dormant state with respect tothe SCG; determining to perform a recovery procedure with the UE or tonot perform the recovery procedure in response to the report; andtransmitting, to the UE, an indication that the recovery procedure willbe performed or not performed.
 15. The method of claim 14, wherein thereceiving of the report comprises receiving the report in a randomaccess channel (RACH) message on the PSCell.
 16. The method of claim 14,wherein the receiving of the report comprises an indication of a bestdownlink (DL) beam for the PSCell or the SCell of the SCG forcommunicating with the UE in response to the beam failure being detectedon the PSCell or the SCell.
 17. The method of claim 14, wherein thereceiving of the report comprises receiving the report from a masternode (MN) having a master cell group (MCG).
 18. The method of claim 17,wherein the receiving the report from the MN comprises receiving thereport via one of a radio resource control (RRC) message, a media accesscontrol control element (MAC CE) message, or a downlink controlinformation (DCI) message.
 19. The method of claim 17, wherein thereport includes an indication of the beam failure being detected on thePSCell or the SCell, wherein the method further comprises transmitting,to the UE via the MN in response to the receiving of the report, anindication of resources for the recovery procedure on the SCG, andwherein the recovery procedure is a beam failure recovery (BFR)procedure.
 20. The method of claim 19, further comprising: communicatingwith the UE through a random access channel (RACH) message on the PSCellin response to the transmitting of the indication of resources for theBFR procedure on the SCG.